Siemens S7-300 Installation And Operating Manual page 85

Wiring scheme for application 2 with single-channel connection of two redundant sensors
Two redundant sensors are wired to a single channel at the two analog modules for each
process signal. The sensors can also be connected to an external sensor supply.
Figure 8-9
Assignable parameters for application 2
Table 8- 3
Parameters
"Parameters" tab
Mode of operation
Module parameters:
Diagnostic interrupt
Module parameters for a power supply group:
Internal sensor supply
of the module
Short-circuit test
For single channels or channel pairs:
activated
"Redundancy" tab **
Redundancy
Redundant module
Discrepancy time
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
Wiring scheme of the SM 326; DI 24 x DC 24V for application 2 – two redundant sensors
single-channel connection
Parameters for application 2 of SM 326; DI 24 x DC 24V
Range of values in standard mode
Standard mode
activated/deactivated
deactivated (for single-channel

connection of a sensor)
activated/deactivated

(for redundant sensor)
activated/deactivated * (only if "Sensor
Supply via Module" is activated)
activated/deactivated
2 modules
(selection of an existing additional
module of the same type)
10 ms to 30000 ms
Digital modules
8.3 SM 326; DI 24 x DC 24V
Type Effective range
static module
static module
static Power supply group
static Power supply group
static channel
static module
static redundant module
pair
static redundant module
pair
85